Water heater having backup power system

Abstract

A water heater includes a case, in which a hot source, a cold source, a thermoelectric cooling chip, and a power requiring unit are provided. The thermoelectric cooling chip has a close loop with a hot junction adjacent to the hot source; and a cold junction adjacent to the cold source, that the thermoelectric cooling chip generates a current through the close loop when a temperature at the hot junction, is higher than a temperature at the cold junction. The power requiring unit is electrically connected to the close loop of the thermoelectric cooling chip; therefore, the power requiring unit may be driven by the power from the thermoelectric cooling chip, when the main power is low or off.

1 . A water heater, comprising:
 a case;   a hot source and a cold source in the case;   a thermoelectric cooling chip, which is mounted in the case, having a close loop with a hot junction adjacent to the hot source, and a cold junction adjacent to the cold source, that the thermoelectric cooling chip generates a current through the close loop when a temperature at the hot junction is higher, than a temperature at the cold junction; and   a power requiring unit electrically connected to the close loop of the thermoelectric cooling chip that the current is transmitted to the power requiring unit.   
     
     
         2 . The water heater as defined in  claim 1 , further comprising a heating device and a water pipe to be heated by the heating device, wherein the water pipe has a cooling section to form the cold source, and a heating section to form the hot source, and the hot junction of the thermoelectric cooling chip is close to the heating section of the water pipe, and the cold junction is close to the cooling section of the water pipe. 
     
     
         3 . The water heater as defined in  claim 1 , further comprising a switch between the thermoelectric cooling chip and the power requiring unit, to allow or cut off the current transmitted from the thermoelectric cooling chip to the power requiring unit. 
     
     
         4 . The water heater as defined in  claim 1 , further comprising a voltage booster electrically connected to the thermoelectric cooling chip, to increase a voltage of the thermoelectric cooling chip to a working voltage. 
     
     
         5 . The water heater as defined in  claim 4 , further comprising a power storage device electrically connected to the thermoelectric cooling chip.